Just saw Harry Potter at an Imax and the 3D conversion was pretty good but there were a few scenes that were not that good. I noticed in one of the scenes of Harry that there was a bright spot on his face that was annoying and another scene you could see a slight double image around the shirt he was wearing around his neck and there was a few other scenes but overall the conversion was good. It seems that the conversions do not give you the out of screen effects that one that is shot in 3D.They had a preview of Happy 2 in 3D and it blew you away with everything seemed to be over your head and snow was falling in the theatre and the reaction from the movie goers was incredible,the best 3D effects I have ever seen